التفاصيل البيبلوغرافية
| العنوان: |
Milk Composition and Apparent Digestibilities of Dietary Fatty Acids in Lactating Dairy Cows Abomasally Infused with Cisor TransFatty Acids1,2,3 |
| المؤلفون: |
Romo, G.A., Erdman, R.A., Teter, B.B., Sampugna, J., Casper, D.P. |
| المصدر: |
Journal of Dairy Science; November 2000, Vol. 83 Issue: 11 p2609-2619, 11p |
| مستخلص: |
Fat supplementation of diets for dairy cows produces changes in nutrient supply and milk composition. The effect of abomasal infusion of either cis-C18:1or trans-C18:1fatty acid isomers on the digestibility of fatty acids and milk composition was determined in lactating dairy cows. Six multiparous midlactation Holstein cows were used and fed a control diet containing 50% forage and 50% concentrate. Treatments were (per day): no infusion, infusion of a 630-g fat mixture high in cis-C18:1isomers, and infusion of a 623-g fat mixture high in trans-C18:1isomers using two 3 × 3 Latin squares with 4-wk experimental periods. Fat infusion did not affect total dry matter intake and increased apparent digestibilities of total fatty acids. Apparent digestibilities of C18fatty acids were directly related to the number of double bonds within isomers, and cis-C18:1isomers were slightly more digestible than trans-C18:1isomers. The lower yield of C12:0, C14:0, and C16:0fatty acids in milk fat and higher milk citrate observed when cows were infused with trans-C18:1suggests a depressed de novo milk fatty acid synthesis. Effects of transinfusion on milk fat were independent of ruminal fermentation, fatty acid apparent absorption, and fatty acid plasma concentrations. Lower milk protein yield in cows infused with fat may have been caused by a decrease in milk protein synthesis. |
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